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Properties Of Concrete

The Merck Index of Chemicals and Drugs An Encyclopedia for the Chemist, Pharmacist, Physician and Allied Professions Sixth edition Pp xiv + 1167 (Rahway, NJ: Merck and Company, Inc, 1952) 750 dollars; thumb-indexed, 8 dollars

The Merck Index

Recent advances in understanding the role of supplementary cementitious materials in concrete

Beneficial role of nanosilica in cement based materials – A review

This paper addresses the development of an eco-friendly Ultra-High Performance Concrete (UHPC) with efficient cement and mineral admixtures uses are investigated. The modified Andreasen & Andersen particle packing model is utilized to achieve a densely compacted cementitious matrix. Fly ash (FA), ground granulated blast-furnace slag (GGBS) and limestone powder (LP) are used to replace cement, and their effects on the properties of the designed UHPC are analyzed. The results show that the influence of FA, GGBS or LP on the early hydration kinetics of the UHPC is very similar during the initial five days, while the hydration rate of the blends with GGBS is mostly accelerated afterwards. Moreover, the mechanical properties of the mixture with GGBS are superior, compared to that with FA or LP at both 28 and 91 days. Due to the very low water amount and relatively large superplasticizer dosage in UHPC, the pozzolanic reaction of FA is significantly retarded. Additionally, the calculations of the embedded CO2 emission demonstrate that the cement and mineral admixtures are efficiently used in the developed UHPC, which reduce its environmental impact compared to other UHPCs found in the literature.

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Development of an eco-friendly Ultra-High Performance Concrete (UHPC) with efficient cement and mineral admixtures uses

https://josbrouwers.bwk.tue.nl/publications/Journal79x.pdf

Water demand of amorphous nano silica and its impact on the workability of cement paste

In this study two different types of nano-silica (nS) were applied in self-compacting concrete (SCC), both having similar particle size distributions (PSD), but produced through two different processes: fumed powder silica and precipitated silica in colloidal suspension. The influence of nano-silica on SCC was investigated with respect to the properties of concrete in fresh (workability) and hardened state (mechanical properties and durability). Additionally, the densification of the microstructure of the hardened concrete was verified by SEM and EDS analyses. The obtained results demonstrate that nano-silica efficiently used in SCC can improve its mechanical properties and durability. Considering the reactivity of the two applied nano-silicas, the colloidal type showed a higher reactivity at early age, which influenced the final SCC properties.

/pdf/scc-modification-by-use-of-amorphous-nano-silica-45brqbd5di.pdf

SCC modification by use of amorphous nano-silica

Concrete is the most common used material for construction and their design consumes almost the total cement production in the world. The use of large quantities of cement produces increasing CO 2 emissions, and as a consequence the green house effect. A method to reduce the cement content in concrete mixes is the use of silica fines. One of the silica fines with high potential as cement replacement and as concrete additive is nano-silica (nS). However, the commercial nS is synthesized in a rather complex way, resulting in high purity and complex processes that make them non-feasible for the construction industry. Furthermore, the application of nS and its effect in concrete is not fully understood yet. In a recent research project a new nano-silica [1-4] is produced from olivine. This nS, as well as commercially available nS, will be applied and tested. In addition, a mix design tool used for self compacting concrete (SCC) [5] [6] will be modified to take into account particles in the size range of 10 to 50 nm. This paper aims to present the state of the art of nS application in concrete, focusing on the nS properties to render it suitable to be applicable in concrete. It includes the nS production process, their addition effect and their application in concrete. Also an overview of the experimental setup and further research is presented.

/pdf/application-of-nano-silica-ns-in-concrete-mixtures-2expvp3syq.pdf

Application of nano-silica (nS) in concrete mixtures

In the present research, the morphological and the textural characteristics of different amorphous nano-silica’s used in concrete were studied. To conduct a detailed characterization of the main properties of micro- and nano-silica, seven selected silica samples produced by different methods were studied thoroughly. The resulting characteristics, such as shape, particle size, specific surface area, density, and pore-size (distribution), are related and compared. Finally, the effects of the nano-silica characteristics on the slump-flow diameter and mechanical properties of standard mortars are discussed. It was found that the main parameters that influence the slump-flow diameter and the final mechanical properties of cement mortars are the specific surface area, the micropore volume and the average size of the primary particles of the silica’s. In addition, no direct influence on the mortar properties related with the silica’s pore diameter and pore-size (distribution) was found.

/pdf/characterization-of-morphology-and-texture-of-several-3e3dkv7zb1.pdf

Characterization of morphology and texture of several amorphous nano-silica particles used in concrete

https://josbrouwers.bwk.tue.nl/publications/Journal84x.pdf

G George Quercia

Papers

Water demand of amorphous nano silica and its impact on the workability of cement paste

SCC modification by use of amorphous nano-silica

Application of nano-silica (nS) in concrete mixtures

Characterization of morphology and texture of several amorphous nano-silica particles used in concrete

The properties of amorphous nano-silica synthesized by the dissolution of olivine